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Inverse Cosine Addition Formula
## Formula
$$\cos^{-1}x+\cos^{-1}y=\cos^{-1}\left(xy-\sqrt{(1-x^2)(1-y^2)}\right)$$
provided the principal-value condition is satisfied.
## Usage
- Used to combine two inverse cosine expressions.
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Inverse Cosine Addition Formula
## Formula
$$\cos^{-1}x+\cos^{-1}y=\cos^{-1}\left(xy-\sqrt{(1-x^2)(1-y^2)}\right)$$
provided the principal-value condition is satisfied.
## Usage
- Used to combine two inverse cosine expressions.
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